I believe the mechanic said he retarded the timing as much as he could.

Also, now that you mention the thermostat, I do remember thinking the ping was a lot better when I picked it up from the mechanic, but got seem to get worse as I drove it. So a new tístat will go in with new plugs/ wires/ cap, etc next week.

I'm still confused if the Q'trac switch should be hooked up to that port on the carb and whether or not my vac advance is hooked up correctly.

What Shawn and I are suggesting is for you to disconnect the dizzy from the "spark port", plug that port, and find a manifold vac source to connect it to.

The difference between manifold and ported is manifold has full vac at idle, ported has zero vac at idle. Hooking the dizzy to manifold will activate the advance at idle, thereby advancing the timing and cooling the combustion temps. Ported vac was developed for emissions purposes at the expense of engine performance.

Hope this helps,

Matt

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On both of the Quadratrac Jeeps I have/had, the supply is/was hooked up to a small nipple on the intake manifold just behind the carb, not directly to the carb. This was a 304 and a 360. When I installed a 258 in the Jeep I placed a "T" in the vacuum line from the carb to the distributor. You will want full manifold vacuum to the switch/valve in The glove box.

One of the first things I would check is the hold down bolt for the distributor.